InkFlow

A modern infinite whiteboard application built with Python and PySide6.

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🚀 Project Status

InkFlow is currently in active development. The foundation of the application has been built, focusing on creating a scalable architecture that will support multiple drawing tools and future features.

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Features Implemented till date

Pen Tool

• Smooth freehand drawing
• Rounded stroke caps
• Rounded joins for natural handwriting
• Adjustable pen width
• Automatic stroke creation using QPainterPath

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• Single Click Dot Drawing

InkFlow automatically detects when the mouse is clicked without movement and draws a perfectly centered filled dot instead of creating an empty stroke.

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Infinite Canvas

The application currently provides a large virtual drawing area using QGraphicsScene, allowing users to freely move around while drawing.

Current scene size:

5000 × 5000 px

This will later evolve into a dynamically expanding infinite canvas.

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Panning

Navigate around the canvas using:

• Middle Mouse Button + Drag
• Hold Space + Left Mouse Drag

The camera moves independently of the drawing system, allowing a smooth workflow similar to professional whiteboard applications.

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Zoom

Implemented mouse-wheel zoom with:

• Zoom centered around the mouse cursor
• Geometric zoom progression
• Minimum zoom limit
• Maximum zoom limit

This provides smooth navigation without distortion.

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Architecture

One of the major goals of InkFlow is maintaining a clean and extensible architecture.

Instead of placing all functionality inside a single Canvas class, responsibilities have been separated.

MainWindow
│
└── Canvas
     │
     ├── Camera (Pan & Zoom)
     ├── Scene Management
     └── Tool System
             │
             └── Active Tool

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Tool System

InkFlow has a modular tool architecture, which makes it easier to maintain.

Current hierarchy:

BaseTool
    │
    └── PenTool

Each tool is responsible for implementing its own:

• Mouse Press
• Mouse Move
• Mouse Release

This allows future tools to be added without modifying the core canvas.

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Tool Registry

Canvas maintains a registry of available tools.

Example:

self.tools = {
    "pen": PenTool(self)
}

The active tool is simply a reference to one of these objects.

self.active_tool = self.tools["pen"]

This makes switching tools straightforward while preserving each tool’s internal state.

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Current Project Structure

InkFlow/
│
├── main.py
│
├── ui/
│   ├── main_window.py
│   └── canvas.py
│
├── tools/
│   ├── base_tool.py
│   └── pen_tool.py
│
└── assets/

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Current Development Goals

• Build a modular tool system
• Keep the codebase clean and scalable
• Separate UI logic from drawing logic
• Prepare the project for future expansion

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Planned Features

The following features are planned for future versions:

• Tool Toolbar
• Eraser Tool
• Rectangle Tool
• Circle Tool
• Line Tool
• Arrow Tool
• Text Tool
• Selection Tool
• Color Picker
• Brush Size Controls
• Undo / Redo
• Layers
• Infinite Dynamic Canvas
• Save / Load Projects
• Export to PNG
• Export to PDF
• Keyboard Shortcuts
• Custom Themes

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Design Philosophy

InkFlow is being designed with long-term maintainability in mind.

Instead of building features as one large class, the project follows an object-oriented architecture where each component has a single responsibility.

This approach makes adding new tools and features significantly easier while keeping the codebase organized and maintainable.

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Controls:-
Panning = Mouse scroll wheel button
= space bar + mouse left click button

Drawing = left mouse button